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Increasing or Decreasing Current Health Care Cost Trend (Detail) - Postretirement Benefits - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2018 | May 31, 2017
U.S. Plans |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | $ 185 | $ 229
1% Increase in trend rate, postretirement cost | 7 | 9
1% Decrease in trend rate, accumulated benefit obligation | (163) | (201)
1% Decrease in trend rate, postretirement cost | (6) | (8)
Non-U.S. Plans |  |
1% Increase (Decrease) in healthcare cost trend rate |  |
1% Increase in trend rate, accumulated benefit obligation | 6,978 | 6,410
1% Increase in trend rate, postretirement cost | 673 | 547
1% Decrease in trend rate, accumulated benefit obligation | (5,391) | (5,016)
1% Decrease in trend rate, postretirement cost | $ (493) | $ (406)

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